Not unique to Chevys either. Seems to be worse with multi-weight oils. My first job out of HS was at a service station. Bosses wife drove a 58 Cad, sedan DeVille. Only two years old at the time. Oil changes at 3k, never more. Oil of choice was Phillips Trop-Artic, 10w30. One of the first multi-weights. At 1500 miles it would need a quart. At 2500 another quart. At oil change time it was a quart low.
As an experiment at one change we put in a straight 30w for winter use. No added oil needed between changes.
That said, I'd bet on valve guides/seals as the cause. Cheap to try a set of umbrella seals. Positive seals are better, but require removing the head to machine the guide ends. Then you might as well do a full valve job.
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